With the issuance of the Sluggers stamps, the U.S. Postal Service recognizes the accomplishments of four baseball greats: Mickey Mantle, Mel Ott, Roy Campanella, and Hank Greenberg. Remembered as powerful hitters who wowed fans with awesome and often record-breaking home runs, these four men were also versatile players who helped to lead their teams to victory and set impressive standards for subsequent generations.